4-Oxo-3-(R,S)-pyridin-2-ylmethyl-piperidine-1,3-dicarboxylic Acid 1-tert-butyl ester 3-methyl ester
3-(R,S)-benzyl-4-oxo-piperidine-1,3-dicarboxylic acid 1-tert-butyl ester 3-methyl ester
methyl 1-tert-butoxycarbonyl-4-oxo-3-ethyl-3-piperidinecarboxylate
4-Benzylamino-5,6-dihydro-2H-pyridine-1,3-dicarboxylic acid 1-tert-butyl ester 3-methyl Ester
6-oxo-4,6,7,8-tetrahydro-3H-isoquinoline-2,8a-dicarboxylic acid 2-tert-butyl ester 8a-methyl ester